package com.lyz.dataStructure.dome;/**
 * @Author:759057893@qq.com Lyz
 * @Date: ${Date} 13:53
 * @Description:
 **/

import java.util.*;

/**
 *@Author:759057893@qq.com Lyz
 *@Date: 2019/8/25 13:53
 *@Description:
 **/
public class Test {

    public static void main(String[] args) {
        ArrayList list = new ArrayList();
        list.add(5);
        System.out.println(list.isEmpty());
        List list1 = new Vector();
        list1.add(5);
        list1.add(6);
        list1.add(7);
        System.out.println(list1.get(2));

        Set set = new HashSet<>();
        System.out.println(set.iterator());
    }
}
